include/vcl/vclreferencebase.hxx

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   3  * This file is part of the LibreOffice project.
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   9  * This file incorporates work covered by the following license notice:
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  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
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  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19 #ifndef INCLUDED_VCL_Reference_HXX
  20 #define INCLUDED_VCL_Reference_HXX
  21
  22 #include <vcl/dllapi.h>
  23 #include <osl/interlck.h>
  24
  25 class VclBuilder;
  26
  27 class VCL_DLLPUBLIC VclReferenceBase
  28 {
  29     mutable oslInterlockedCount mnRefCnt;
  30
  31     template<typename T> friend class VclPtr;
  32     friend class ::VclBuilder; // needed by ::delete_by_window(vcl::Window *pWindow)
  33
  34 public:
  35     void acquire() const
  36     {
  37         osl_atomic_increment(&mnRefCnt);
  38     }
  39
  40     void release() const
  41     {
  42         if (osl_atomic_decrement(&mnRefCnt) == 0)
  43             delete this;
  44     }
  45 #ifdef DBG_UTIL
  46 #ifndef _WIN32
  47     sal_Int32 getRefCount() const { return mnRefCnt; }
  48 #endif
  49 #endif
  50
  51
  52 private:
  53     VclReferenceBase(const VclReferenceBase&) = delete;
  54     VclReferenceBase& operator=(const VclReferenceBase&) = delete;
  55
  56     bool                        mbDisposed : 1;
  57
  58 protected:
  59                                 VclReferenceBase();
  60     virtual                     ~VclReferenceBase();
  61
  62     // This is only supposed to be called from disposeOnce
  63     virtual void                dispose();
  64
  65 public:
  66     // This is normally supposed to be called from VclPtr::disposeAndClear
  67     void                        disposeOnce();
  68
  69     bool                        isDisposed() const { return mbDisposed; }
  70
  71 };
  72 #endif